Synonym: chance, endanger, expose, gamble, hazard, imperil, jeopardize, venture. Antonym: safety. Similar words: brisk, risky, disk, rise, perish, Irish, arise, wrist. Meaning: [rɪsk] 
n. 1. a source of danger; a possibility of incurring loss or misfortune 2. a venture undertaken without regard to possible loss or injury 3. the probability of becoming infected given that exposure to an infectious agent has occurred 4. the probability of being exposed to an infectious agent. v. 1. expose to a chance of loss or damage 2. take a risk in the hope of a favorable outcome.
n. 1. a source of danger; a possibility of incurring loss or misfortune 2. a venture undertaken without regard to possible loss or injury 3. the probability of becoming infected given that exposure to an infectious agent has occurred 4. the probability of being exposed to an infectious agent. v. 1. expose to a chance of loss or damage 2. take a risk in the hope of a favorable outcome. 
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151. Meat from the infected animals is regarded as a serious health risk .
152. At the risk of sounding stupid, can I ask a question?
153. You can use it, but it's at your own risk.
154. The British could afford to reduce defence spending in peacetime without excessive risk.
155. Lack of exercise is a risk factor in heart disease.
156. Smoking is known to increase a person's risk of developing lung cancer.
157. She wondered if she dared risk sullying the gleaming sink.
158. Those old boxes in the corridor are a fire risk.
159. Women are more at risk from the harmful effects of alcohol than men.
160. If a woman gives up her job to look after her baby(sentencedict.com), she will risk losing her salary in the medium-term and may seriously damage her long-term career prospects.
161. A certain element of risk is in the nature of the job.
162. Those who wish to come here will do so at their own risk.
163. Make sure that your immunisations are up to date to lessen the risk of serious illness.
164. Some people are worried that electromagnetic fields from electric power lines could increase the risk of cancer.
165. If we go to war, innocent lives will be put at risk.
166. Smoking multiplies the risk of heart attacks and other health problems.
167. At the risk of stating the obvious, people who have not paid cannot be admitted.
168. Patient education is important to minimize the risk of a second heart attack.
169. The trouble with a back injury is that there is a great risk of recurrence.
169. Sentencedict.com is a online sentence dictionary, on which you can find excellent sentences for a large number of words.
170. He was far too canny to risk giving himself away.
171. Small bones should be avoided as the dog may swallow them whole and risk internal injury.
172. Jobs are at risk, not just on the factory floor but throughout the business.
173. The high risk of infection puts a premium on the use of sterile needles.
174. This is something where you can earn such a lot of money that there is not any risk that you will lose it.
175. It was a difficult decision but we decided to risk it.
176. Their children are also at high risk of developing the disease.
177. Lack of exercise is also a risk factor for heart disease but it's relatively small when compared with the others.
178. There is a risk of transmission of the virus between hypodermic users.
179. Advertising is not an exact science - you're always taking a risk.
180. The impurity of the water is a serious health risk.